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GCN Circular 27575

GRB 200412B: Tautenburg observations
2020-04-14T10:45:57Z (4 years ago)
Sylvio Klose at TLS Tautenburg <>
S. Klose, B. Stecklum, S. Melnikov, and A. Nicuesa Guelbenzu (all 
Tautenburg) report:

We continued observing the field of GRB 200412B (Fermi GBM team, GCN 
27547) with the Tautenburg 1.34m Schmidt telescope equipped with the 
TAUKAM 6k x 6k CCD camera and the wide V-band filter (VB; Stecklum et al., 
GCN 27567).

For the optical transient (Lipunov et al., GCN 27555, 27556) at a mean 
time APR 13, 21:08:59 UT (1.500 days post burst) we measure VB = 20.27 +/- 
0.03. Compared to our 1st-epoch observations (dt=0.51 days; Stecklum et 
al., GCN 27567) this provides a decay slope of alpha = 1.58 (F\nu \propto 
t**(-\alpha)), in agreement with the results reported by Xin et al. (GCN 
27571) and Belkin et al. (GCN 27574).
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